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Specifications for the WD Caviar® WD205AA

Recommended Parameters
Physical Specifications
Performance Specifications
Physical Dimensions
Electrical Specifications
Environmental Specifications

Recommended Setup Parameters
Cylinders 1 16383 
Heads 16
Sectors/Track 63
Landing Zone 16383
WPC 16383
Jumper Setting Information Ten Pin Drive
10 Pin Jumper Settings

1 All EIDE drives 8.4 GB and larger use 16383 cylinders, 16 heads and 63 SPT due to interface restrictions. Click here for more information.

Physical Specifications
Formatted Capacity 1 20,520 MB 
Interface 40-pin EIDE
Actuator Type Rotary Voice Coil
Number of Disks 3
Data Surfaces 6
Number of Heads 6
Bytes Per Sector 512
User Sectors Per Drive 40,079,088
Servo Type Embedded
Recording Method EPR4 Rate 16/17 PRML
ECC Reed Solomon
Head Park 2 Automatic

PRML - Partial Response Maximum Likelihood
EIDE - Enhanced Integrated Drive Electronics

1 Western Digital defines a megabyte (MB) as 1,000,000 bytes and a gigabyte (GB) as 1,000,000,000 bytes
2 Turning the system power off causes the WD Caviar® to perform an automatic head park operation.

Performance Specifications
Average Seek
- Read
- Write
9.5 ms typical, 15 ms maximum
11.5 ms typical, 17 ms maximum
Track-to-Track Seek 2.0 ms typical, 5 ms maximum
Full Stroke Seek 19 ms typical, 23 ms maximum
Index Pulse Period 11.11 ms (nominal)
Average Latency 5.5 ms (nominal)
Rotational Speed 5400 RPM (nominal)
Controller Overhead 0.3 ms average
Data Transfer Rate (maximum)
- Buffer to Host




- Buffer to Disk

66.6 MB/s (Mode 4 Ultra ATA)
33.3 MB/s (Mode 2 Ultra ATA)
16.6 MB/s (Mode 4 PIO)
16.6 MB/s (Mode 2 multi-word DMA)

133.33 Mbits/s minimum
233.57 Mbits/s maximum
Interleave 1:1
Buffer Size 2 MB
Error Rate - Unrecoverable <1 in 1014 bits read
Spindle Start Time
- From Power-on to Drive Ready 1
- From Power-on to Rotational Speed 2
6 s typical, 16 s maximum 
4.5 s typical, 12 s maximum 
Spindle Stop Time 4 s typical
Contact Start/Stop Cycles (CSS) 40,000 minimum

1 Defined as the time from power-on to the setting of the Drive Ready and Seek Complete including calibration.
2 Defined as the time from power-on to when the full spindle rotational speed is reached.

Physical Dimensions
Height English: 1.00 inch ±0.02 inch
  Metric: 25.4 mm ±0.51 mm
Length English: 5.75 inches ±0.02 inch
  Metric: 146.05 mm ±0.51 mm
Width English: 4.00 inches ±0.02 inch
  Metric: 101.6 mm ±0.51 mm
Weight English: 1.1 pounds ±0.11 pounds
  Metric: 0.500 kg ±0.050 kg

Electrical Specifications
Current Requirements and Power Dissipation
Operating Mode   RMS Current   Power, Typical 1
  12 VDC 5 VDC  
Spinup 1.8 A max 530 mA 24.3 W
Read/Write/Idle 240 mA 660 mA 6.18 W
Seek 580 mA 600 mA 9.96 W
Power Management Commands
Operating Mode  RMS Current 1 Power, Typical 1
  12 VDC 5 VDC  
Idle (E1H) 240 mA 660 mA 6.18 W
Standby (E0H) 30 mA 192 mA 1.32 W
Sleep (E6H) 30 mA 96 mA 0.84 W
Input Voltage Requirements
+5.0V (±5%) and 12.0V (±10%)
Ripple
  +12 VDC +5 VDC
Maximum
Frequency
200 mV (double amplitude)
0-20 MHz
100 mV (double amplitude)
0-20 MHz
Power Connectors and Cables
Power Connector 4-pin AMP (P/N 84069-1 or equivalent)
Mating Connector Body (AMP 1-480424-0 or equivalent)
Pins (AMP 60619-4 or equivalent)
Power Cable Wire gauge 18 AWG (or heavier)

1 All values are typical (25°C, 5.0V, and 12V input) except where specified as maximum.

Note: Current measurements cut off frequency at 1 kHz.

Environmental Specifications
Shock 1
  Operating 20 G, 2 ms
  Non-operating 200 G, 2 ms
Vibration
  Operating 5-20 Hz, 0.037 inches (double amplitude)
20-300 Hz, 0.75 G (0 to peak)
  Non-operating 5-20 Hz, 0.195 inches (double amplitude)
20-500 Hz, 4.0 G (0 to peak)
  Sweep Rate One-octave/minute minimum
Drive Generated Vibration
  Operating 0.10 G maximum with the drive in an unconstrained condition.
Rotational Shock Non-Operating
  Amplitude 15K rad/sec2
  Duration 2 ms
Operating Temperature and Humidity
  Temperature 2 5°C to 55°C (41°F to 131°F) 
5°C to 65°C (case temp.)
  Humidity 5-85% RH non-condensing
33°C (maximum wet bulb)
  Thermal Gradient 20°C/hour (maximum)
  Humidity Gradient 20%/hour (maximum)
Non-Operating Temperature and Humidity
  Temperature 3 -40°C to 60°C (-40°F to 140°F) 
  Humidity 5-95% RH non-condensing
33°C (maximum wet bulb)
  Thermal Gradient 30°C/hour (maximum)
  Humidity Gradient 20%/hour (maximum)
Altitude
  Operating -1000 feet to 10,000 feet (-305M to 3,050M)
  Non-Operating -1000 feet to 40,000 feet (-305M to 12,200M)
Acoustics
  Idle Mode 4 33 dBA average, 37 dBA maximum 
  Seek Mode 5 39 dBA average, 43 dBA maximum 
Reliability Specifications
  AFR <0.8%
  MTBF 500,000 Power On Hours
  MTTR 10 minutes (typical)
  Component Design Life 5 years

1 Half sine wave, measured without shock isolation and without non-recoverable errors.
2 The system environment must allow sufficient air flow.
3 To ensure test is non-condensing, set chamber RH to 85% maximum. To maintain 85% max, set dry bulb to 35.5ºC which maintains 33ºC wet bulb.
4 No audible pure tones.
5 Random seek at a rate of 26 seeks per second.




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